Blood lactate concentration and delayed muscle soreness: a strategy of practical class for the teaching the integrated metabolic events/Concentracao sanguinea de lactato e dor muscular tardia: estrategia de aula pratica para o ensino integrado dos eventos metabolicos

Our study aimed to identify the mechanisms of action/removal of lactate in a state of exhaustive exercise and to monitor the damage onset muscle soreness (DOMS) progresses due to the fatigue installed. Computerized exercises on a treadmill and cycle ergometer were conducted during a class of Biochemistry of Exercise, with analysis of blood lactate at various times after exercise. For evaluation of DOMS, we used a scale of subjective perception. There was a significant increase (p < 0.001) in lactate concentration immediately after exercise for both exercise models, with a return close to normal levels within 1 hour after exhaustion. The manifestation of pain peaked between 24-72 hours after exercise, which led students to understand that there are distinct metabolic strategies of recovery after exhaustive exercise performance. Key words: lactate, damage onset muscle soreness, learning. Nosso estudo teve como objetivo identificar os mecanismos de acao/remocao do lactato em situacao de exercicio exaustivo e acompanhar como a dor muscular tardia (DMT) progride em decorrencia do processo de fadiga metabolica instalada. Exercicios em esteira computadorizada e cicloergometro foram realizados durante uma aula de Bioquimica do Exercicio, havendo coleta de lactato em varios tempos apos o exercicio. Para avaliacao da DMT, utilizou-se uma escala de percepcao subjetiva de DMT. Houve aumento significativo (p < 0.001) em concentracao de lactato imediatamente apos o esforco para os dois modelos de exercicio, com retorno proximo a niveis normais em 1 hora apos a exaustao. A manifestacao de dor teve seu pico entre 24-72 horas apos o exercicio, o que levou os alunos a compreenderem que existem estrategias metabolicas distintas de recuperacao apos a execucao de exercicio exaustivo. Palavras-chave: Lactato, Dor muscular tardia, Aprendizagem.